fix corner case in semicolons (#5881)

fixes #5880

Author: alexlamsl

lib/ast.js

@@ -965,9 +965,12 @@ var AST_ClassProperty = DEFNODE("ClassProperty", "key private static value", {
             if (this.key != null) throw new Error("key must be null");
         } else if (typeof this.key != "string") {
             if (!(this.key instanceof AST_Node)) throw new Error("key must be string or AST_Node");
+            if (this.private) throw new Error("computed key cannot be private");
             must_be_expression(this, "key");
+        } else if (this.private) {
+            if (!/^#/.test(this.key)) throw new Error("private key must prefix with #");
         }
-        if(this.value != null) {
+        if (this.value != null) {
             if (!(this.value instanceof AST_Node)) throw new Error("value must be AST_Node");
         }
     },
@@ -976,7 +979,7 @@ var AST_ClassProperty = DEFNODE("ClassProperty", "key private static value", {
 var AST_ClassField = DEFNODE("ClassField", null, {
     $documentation: "A `class` field",
     _validate: function() {
-        if(this.value != null) must_be_expression(this, "value");
+        if (this.value != null) must_be_expression(this, "value");
     },
 }, AST_ClassProperty);
 

lib/output.js

@@ -1251,6 +1251,12 @@ function OutputStream(options) {
             output.print("=");
             output.space();
             self.value.print(output);
+        } else switch (self.key) {
+          case "get":
+          case "set":
+          case "static":
+            output.force_semicolon();
+            return;
         }
         output.semicolon();
     });

test/compress/classes.js

@@ -4177,3 +4177,52 @@ issue_5878_4: {
     expect_stdout: "function"
     node_version: ">=4"
 }
+
+issue_5880_1: {
+    beautify = {
+        semicolons: false,
+    }
+    input: {
+        new class {
+            get;
+            p = console.log("PASS");
+        }();
+    }
+    expect_exact: 'new class{get;p=console.log("PASS")}\n'
+    expect_stdout: "PASS"
+    node_version: ">=12"
+}
+
+issue_5880_2: {
+    beautify = {
+        semicolons: false,
+    }
+    input: {
+        class A {
+            set;
+            static {
+                console.log("PASS");
+            }
+        }
+    }
+    expect_exact: 'class A{set;static{console.log("PASS")}}'
+    expect_stdout: "PASS"
+    node_version: ">=16"
+}
+
+issue_5880_3: {
+    beautify = {
+        semicolons: false,
+    }
+    input: {
+        new class {
+            static;
+            f() {
+                console.log("PASS");
+            }
+        }().f();
+    }
+    expect_exact: '(new class{static;f(){console.log("PASS")}}).f()\n'
+    expect_stdout: "PASS"
+    node_version: ">=12"
+}

test/sandbox.js

@@ -73,7 +73,7 @@ exports.patch_module_statements = function(code, module) {
         } while (code.indexOf(name) >= 0);
         return header.slice(0, -1) + " " + name + header.slice(-1);
     }).replace(/\bimport\.meta\b/g, function() {
-        return '({ url: "https://example.com/path/index.html" })';
+        return 'Object.create({ url: "https://example.com/path/index.html" })';
     }).replace(/\bimport\b(?:\s*([^\s('"][^('"]*)\bfrom\b)?\s*(['"]).*?\2(?:$|\n|;)/g, function(match, symbols) {
         if (symbols) {
             if (!/^[{*]/.test(symbols)) symbols = "default:" + symbols;